No. 0096E KHWS1W KHWS1WUN
CONTENTS SPECIFICATIONS ..................................................................................................................................................... 2 SERVICE POINTS ..................................................................................................................................................... 3 ADJUSTMENTS ......................................................................................................................................................... 7 TROUBLESHOOTING ............................................................................................................................................... 10 BLOCK DIAGRAM OF ANTENNA AND TUNER UNIT ............................................................................................ 17 DATA OF MICROPROCESSOR ............................................................................................................................... 18 SEMICONDUCTORS ................................................................................................................................................. 24 WIRING DIAGRAM .................................................................................................................................................... 30 PRINTED WIRING BOARD ....................................................................................................................................... 31 METHOD OF REMOVED IC ..................................................................................................................................... 36 CIRCUIT DIAGRAM ................................................................................................................................................... 37 BLOCK DIAGRAM ..................................................................................................................................................... 41 EXPLODED VIEW ...................................................................................................................................................... 43 REPLACEMENT PARTS LIST .................................................................................................................................. 45
This documentation is applied to rescrictions for management, export and supply to overseas based on the Wassenaar Arrangement.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
DIGITAL RECEIVER November 1999 01/BKpg KH-WS1 cover
1
HITACHI CONSUMER PRODUCTS (S) 10/11/00, 1:42 PM
KH-WS1
Check that exposed parts are acceptably insulated from the supply circuit before returning the repaired instrument to the customer.
INSTRUMENT
• Checking method
(Exposed part)
Measure the resistance value between the both poles of attachment cup (Power supply plug) and the exposed parts (Parts such as Knob, Cover, etc. where the customer is easy to touch.) and check that the resistance value is 500 kohms or more.
Insulation tester (DC 500V)
SAFETY PRECAUTIONS The following precautions should be observed when servicing. 1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachi’s replacement parts. Especially critical parts in the power circuit block should not be replaced with other makers. Critical parts are marked with in the circuit diagram and printed wiring board. 2. Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain that it is completely safe to operate without danger of electrical shock.
SPECIFICATIONS
• General Specifications
• WS (WorldSpace digital broadcast) Section
Power supply:
Circuit system: Broadcast method: Receiver frequency: Input/Output terminals Antenna input terminal Type/Impedance: Polarization voltage:
Digital Receiver WorldStar 1 Method L-Band (1453.384-1490.644 MHz)
F-type/50 Ω LHCP 2.5-2.2 V RHCP 3.3-2.8 V Max. current supply: 70 mA External terminal: 9-pin, for future expansion WS antenna (Built-in, detachable type): WorldStar 1 Method compatible antenna Gain: over 6 dBi Dimensions: 150 x 33 x 156 mm (w x h x d)
• Radio Section Circuit system: Tuning range:
Antennas:
FM/MW/SW1/SW2 4-bands Superheterodyne FM: 87.5 - 108 MHz MW: 522 - 1620 kHz (9 kHz steps) 520 - 1620 kHz (10 kHz steps) SW1:2.300-7.300 MHz Meter band: 120, 90, 75, 60, 49, 41 m SW2:9.500-26.100 MHz Meter band: 31, 25, 21, 19, 16, 13, 11 m FM/SW1/SW2: Telescopic antenna (aerial) MW: Built-in ferrite-core antenna (aerial)
AC: 110-127 V/220-240 V, 50/60 Hz DC: 6 V “D” cell or IEC R20 or equivalent x 4 (Optional) DC input jack Input voltage : DC 6 V + 30%, –10% (DC 7.8 V – 5.4 V) Current consumption: max. 400 mA Power (mains) consumption: 5 W Audio output: 3 W (PMPO) 300 mW (DC operation, 10% THD) Speaker: 65 mm Cone/8 Ω Output/Impedance: Headphones (stereo)/ Suitable impedance: 8-100 Ω Line out (stereo)/2.2 kΩ Battery life time: 30 hours over by using alkaline (LR20) batteries. 12 hours over by using manganic (R20P) batteries. (Use HITACHI battery/Measured method: EIAJ CP-2905A) Dimensions: 240.5 x 162.5 x 64.5 mm 240.5 x 162.5 x 93 mm (w x h x d) (including the WS antenna and handle) Weight: 1.5 kg (without batteries), 1.9 kg (with batteries)
• Accessories AC power cord: AC plug adaptor: F-type connector: Waterproof cover: Waterproof tape:
1 1 1 set (for making an extention coaxial cable) 1 1
NOTE: * Specifications are subject to change without notice.
–2–
KH/Pg 02 (Spec)
2
10/11/00, 1:44 PM
KH-WS1
SERVICE POINTS 1. Removal of Back Case (Fig. 1) (1) Remove 3 screws 1 from the back and 2 screws 2 inside the battery compartment. (2) Detach the Antenna from the Ant }. (3) Detach the connector A. 2. Removal of SATELLITE P.W.B. Board (Fig. 2) (1) Detach all connectors B, C and D. (2) Remove 1 screw 3 from the Satellite P.W.B. Board. (3) Remove 2 screws 4 from the Satellite P.W.B. Board. (4) Release the 3 catches and slide the Satellite P.W.B. Board away. 2. Removal of TUNER P.W.B. Board (Fig. 3) (1) Detach 5 connectors E, F, G, H and I from the Tuner P.W.B. Board. (2) Turn to the opposite side, remove 1 screw 5 from the Tuner P.W.B. Board. (3) Detach 9 catches and separate the Tuner P.W.B. Board from the sub-chassis. 3. Removal of Insulator Pad (Fig. 4) (1) Remove 6 screws 5 from the Insulator pad. 4. Removal of Main Board (Fig. 5) (1) Remove 4 screws 6 from the Main Board. 5. Removal of Speaker (Fig. 6) (1) Release one end of the metal pin that secures the speaker position. (2) Slide out the speaker. 6. Removal of POWER SUPPLY P.W.B. Board (Fig. 7) (1) Remove 4 screws 7 and detach 1 connector J from the Power Supply P.W.B. board. 7. Removal of ANTENNA P.W.B. Board (Fig. 7) (1) Remove 1 screw 9 from the Antenna P.W.B. board. (2) Gently pull the Antenna P.W.B. board outwards. 8. Removal of WS ANTENNA SUPPORT PLATE (Fig. 7) (1) Remove the 6 screws 8 and pull the WS Antenna Support Plate away from the Back case.
–3–
KH/Pg 03 (Service Pt)
3
10/11/00, 2:23 PM
KH-WS1
Front case Back case
1
2 3 Catches
Battery cover
Fig. 1
Ant · 3
Connector A Connector D Connector B
Connector C
4 Connector G Connector F
Fig. 2
Connector I
Connector H
Connector E Sub-Chassis
Fig. 3
9 Catches 5
–4–
KH/Pg 04-06 (disassembling)
4
10/11/00, 1:47 PM
KH-WS1
5
Fig. 4
6
Fig. 5
–5–
KH/Pg 04-06 (disassembling)
5
10/11/00, 1:47 PM
KH-WS1
metal pin
Fig. 6
9
7
Connector J 8
Fig. 7
–6–
KH/Pg 04-06 (disassembling)
6
10/11/00, 1:47 PM
KH-WS1
ADJUSTMENTS • Adjustment points (Must adjust RADIO Part only. Adjustment on WS Part is not necessary.)
Remarks: * After adjustment, should be fix following parts by Electro Wax. "L201, L202, L206" * After adjustment, do not touch the alighed components. (especially L201 and L202)
–7–
KH/Pg 07-09 (Adjustment)
7
10/11/00, 1:48 PM
KH-WS1
• Adjustments (1) Before Adjustment 1) Set the Power SW to ON. 2) Set the Radio Function. (2) Alignment for Tuning Capacitor Voltage Range (Covering) 1) Required Instruments * Signal Generator * DC volt meter 2) Alignment Procedure * Connect a DC Volt meter to TP4 (J201) Band
Output Terminal
FM
TP4
MW
TP4
SG frequency & SET Tune
Adjustment
Reading
87.5 MHz
L202
1.4 V ±0.1
108 MHz
–
6 ~ 7.5 V
1) 520 kHz (10 kHz step)/522 kHz (9 kHz step)
L210
1.2 V ±0.1
2) 1620 kHz
CT207
7.2 V ±0.3
1) 2.3 MHz
L208
1.1 V ±0.1
2) 7.3 MHz
CT205
8.8 V ±0.3
1) 9.5 MHz
L209
1.6 V ±0.1
2) 26.1 MHz
CT206
9.0 V ±0.3
3) Repeat step 1-2 SW1
TP4
3) Repeat step 1-2 SW2
TP4
3) Repeat step 1-2
(3) Alignment for AM IF and MW, SW1, 2 Tracking Step
Item
Required Instrument & Connection Instrument
1
AM IF
Genescope (*1)
Genescope or
Receiving
Adjust
Reading
Max.
Input
Output
SG Freq.
Freq. (Set)
Ferrite Ant.*2
TP1
450 kHz
High end Freq.
T202
F. Ant *2
TP1
600/603 kHz
600/603 kHz
L206
1400/1404 kHz
CT204
Note 1 2
3
(1)
MW Ant
AM signal generator
(2)
400 Hz, 30% Mod.
1400/1404 kHz
(3)
ACVTM, oscillscope
Repeat steps (1) & (2)
(1)
SW1 Ant
MW: Note 2
P1
TP1
(2) (3) 4
(1)
SW1,2: Note 5 SW2 Ant
3.2 MHz
3.2 MHz
L205
7.1 MHz
7.1 MHz
CT203
P1
TP1
(3)
11.65 MHz
11.65 MHz
L204
21.45 MHz
21.45 MHz
CT202
Repeat steps (1) & (2)
Remarks: Instrument Connection *1: With a 470 µF/6.3 V capacitor to the TP2 (-) and J209/+B(+) "IC202". *2: Mean Note 2 (See page 17) 6dB.
–8–
KH/Pg 07-09 (Adjustment)
8
Max.
Repeat steps (1) & (2)
(2)
Note: AM TRACKING ERROR SPEC
Max.
10/11/00, 1:48 PM
Max.
KH-WS1
(4) Alignment for FM IF and FM Tracking Step
Item
1
IF
Required Instrument & Connection
Genescope or
Receiving
Instrument
Input
Output
SG Freq.
Freq. (Set)
Genescope
IC201
TP1
10.7 MHz
High End (or
Note 3 2
(1)
FM
FM signal
Adjust
Reading
T201
Max.
106.1 MHz)Freq.
P1
TP1
90.2 MHz
Note 4
90.2 MHz
L201
106.1 MHz
CT201
(2)
Generator
106.1 MHz
(3)
400 Hz, 22.5 kHz Dev
Repeat steps (1) & (2)
Max.
Note 6
Note: 1. Feed in a week signal from the Genescope. Adjust T202 for max. gain and the waveform of Fig. 1. 2. Connect AM signal generator to loop antenna, bring near to ferrite antenna. 3. Input signal methode as follows.
4. Feed in a week signal to IC201 (Note 3) from the genescope. Use the T201 core to from the Scurve shown in the Fig. 2. Adjust the symmetry of A and B about point C for linearity. 5. SW1, SW2 dummy antenna is shown in Fig. 3. 6. FM dummy antenna is shown in Fig. 4.
R1=Rg=SG's output impedance (75 Ω), R2=75 - Rg/2
(5) Alignment for Clock Time Accuracy Band
Adjustment
FM
CT301
Procedure
Connection
1) Tune FM to 108 MHz 2) Connect a Freq. Counter to J308
To J308
3) Adjust CT301 to reach the frequency 118.7 MHz ±1.5 kHz
–9–
KH/Pg 07-09 (Adjustment)
9
10/11/00, 1:48 PM
To Counter
KH-WS1
TROUBLESHOOTING 1. System Check Connect to AC outlet.
No
Can the time display appear?
No Is the voltage to the Voltage Selector set correctly? Yes
Yes Check IC301 control circuit.
Yes
Can the power SW turn ON?
Is the voltage to IC301 pin 3 V?
Yes
Can the power SW turn ON after pressing the Reset key?
Is the oscillator circuit of IC301 and pin in operation?
Yes
No
IC303 operation
V in
V out
>3.6V
H
